Prevent execute part code in build screen

Author: dani0105

MoreParts/Parts/ContinuousTrackModule.cs

@@ -31,6 +31,11 @@ public override void Awake()
 
         public void Start()
         {
+            if (GameManager.main == null)
+            {
+                base.enabled = false;
+                return;
+            }
             this.Part.onPartUsed.AddListener(this.ToggleEnabled);
             this._on = this.getBoolVariable("wheel_on");
             this._traction = this.getDoubleVariable("traction");

MoreParts/Parts/ExcavatorModule.cs

@@ -40,6 +40,11 @@ public override void Awake()
 
         private void Start()
         {
+            if (GameManager.main == null)
+            {
+                base.enabled = false;
+                return;
+            }
             this._material_container = this.GetMaterialContainer();
             this._target_state = this.getDoubleVariable("target_state");
             this._state = this.getDoubleVariable("state");

MoreParts/Parts/HingeModule.cs

@@ -43,8 +43,12 @@ public override void Awake()
 
         private void Start()
         {
-            
-            if(this._max_opening.Value > 180)
+            if (GameManager.main == null)
+            {
+                base.enabled = false;
+                return;
+            }
+            if (this._max_opening.Value > 180)
             {
                 this._max_opening.Value = 180;
             }